How much is the SEAI external wall insulation grant in Ireland?

The SEAI external wall insulation grant ranges from €3,000 (apartment) to €8,000 (detached house). For semi-detached and end-of-terrace homes the grant is €6,000, and for mid-terrace homes €3,500. These are the 2026 rates — always verify at seai.ie before applying.

What is external wall insulation (EWI)?

External wall insulation (EWI) involves fixing an insulating board to the outside of your walls and covering it with a render or cladding finish. It is the most impactful insulation measure for older Irish homes with solid or poor-cavity walls, significantly reducing heat loss through the walls — typically 25–35% of total heat loss in a poorly insulated home.

SEAI 2026 Rate · Better Energy Homes

External Wall Insulation Grant Ireland — Up to €8,000 from SEAI

External wall insulation (EWI) is one of the highest-impact retrofits available — and the SEAI grant is among the largest individual grants for a single measure. This guide covers amounts by property type, who qualifies, the typical cost range, and the key steps to apply correctly.

Check If My Home Qualifies

Grant Amounts by Property Type

€8,000

Detached

€6,000

Semi-detached / End of terrace

€3,500

Mid-terrace

€3,000

Apartment

One Stop Shop alternative: If planning a deep retrofit to reach B2 BER, the OSS scheme may cover up to 50% of your total project cost — potentially exceeding the individual EWI grant alone. See the OSS guide.

Who Qualifies?

Home built before 2011

Must have been built and occupied before 31 December 2010.

No prior EWI grant

If an external wall insulation grant has already been claimed at this property, you cannot claim again.

SEAI-registered contractor

The contractor must be registered with SEAI specifically for external wall insulation. This is a specialist trade — verify registration at seai.ie/contractor-register.

Apply before work starts

Written grant approval from SEAI must be received before the contractor begins any preparatory or installation work.

Previously claimed cavity wall? You can still claim the EWI grant — they cover different measures. The grants can be combined on the same property.

Realistic Costs vs Grant

EWI is more expensive than other insulation measures — but the grant significantly reduces the cost.

Item	Typical range
EWI installation (semi-detached)	€8,000–€18,000
SEAI EWI grant (semi-detached)	−€6,000
Your net cost (indicative)	€2,000–€12,000

Wide cost range due to property size, access, render finish, and contractor. Always get 3 quotes.

Consider One Stop Shop for large projects. If your EWI is part of a full retrofit (also doing heat pump, attic insulation, etc.), the OSS scheme covering 50% of all costs may deliver more overall than individual grants.

Apply at SEAI.ie

All applications through the official SEAI portal.

Wall Insulation on SEAI.ie

Check All the Grants Your Home Qualifies For

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Related Grant Guides

All SEAI Grants →Cavity Wall Grant →Internal Wall Grant →One Stop Shop →